87 
The stem and the roots have not been particularly 
examined. 
[Chimophila umbellata (L.) DC. (Fig. 5.) 
Material is at my disposal only from the wood ‘‘Sandflugts- 
plantage” at Rønne in Bornholm. 
This species, the leaves of which are coriaceous, presents 
quite a different type of leaf from those of the three mentioned 
above. It stands in the same relation to Pirola uniflora as 
Arctostaphylos Uva-ursi does to Vaccinium Myrtillus. 
The'i-leaf ‘is 
dorsiventral with 
thick outer layers 
in the epidermis, 
consisting of a 
thickened cuticle 
and cuticularized 
layer. Stomata oc- 
eur only on the 
lower surface and 
on a level with the 
epidermis. Hairs 
are absent; starch 
Fig. 5. Chimophila umbellata. 
occurs in both the Cf. note p. 81. (Bornholm: Rönne.) (H.E.P.) 
upper and the lower epidermis. 
The palisade-tissue consists of from two to three layers 
of cells. The structure of the spongy parenchyma is loose 
and it consists of elongated cells, elongated more or less in 
the direction of the length of the leaf. Hydathodes are absent. 
Annual rings are distinctly visible in the stem. Petersen, 
p. 72; SEGERSTEDT, pp. 35—37. 
The roots have not been investigated. | 
Of the above five species only Pirola grandiflora and 
